This isn't the impression we wish to leave you with, @NickMan1313.

Rest assured, I'm going to submit feedback to the Product Development Team about bringing in the option for a Customer filter to the A/P Aging Detail Report in QuickBooks Online. You can visit our Blog to see what's new in our products, as well as seeing what's coming in the future.

If you have any further questions or concerns, please don't hesitate and reach back out! I'm happy to help in any way that I can. Have a beautiful day.